External respiration or breathing is a process of inhaling the air into the lungs and expelling the air that contains more carbon-di-oxide from the lungs to the outer environment. Exchange of gases in and out of the blood also takes place simultaneously.
Two paired sheets of muscle from the ribs to the pelvis that flex you forward. Transversus Abdominis. The deepest ab muscle, which wraps around the waist to support the spine. Think of your ab muscles as the meat in the middle of a fat sandwich.On top of them is subcutaneous fat, the stuff you pinch as you look in the mirror.he answer includes factors like body type, fat composition, and possibly even the shape of the pelvic bone, where your ab muscles attach, she says. Theoretically, a wider pelvis can translate into a broad lower abdomen and hips, compared with what's north of the belly button.
Gluteus Maximus. The gluteus maximus is the biggest muscle in the human body. The glutes, as they are commonly known, contain three muscles located at the back of each hip or buttock. The gluteus maximus is the largest and most superficial muscle of the group.It contributes most of the mass that can be seen as the buttocks.It must be large due to its roles in hip extension and lateral rotation, as well as in keeping the body in an erect position.he latissimus dorsi is the widest muscle in the human body. In fact, the English translation of latissimus dorsi is wide back.. The latissimus dorsi, or lats, are fanlike muscles that begin at the spine, run from the thoracic vertebrae to the sacrum, and attach on the upper arm.